1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.search.fetch.subphase;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.BooleanClause.Occur;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.DocValuesTermsQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.search.TopDocsCollector;
import org.apache.lucene.search.TopFieldCollector;
import org.apache.lucene.search.TopScoreDocCollector;
import org.apache.lucene.search.join.BitSetProducer;
import org.apache.lucene.search.join.ParentChildrenBlockJoinQuery;
import org.elasticsearch.ExceptionsHelper;
import org.elasticsearch.common.lucene.Lucene;
import org.elasticsearch.common.lucene.search.Queries;
import org.elasticsearch.index.mapper.DocumentMapper;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.mapper.ObjectMapper;
import org.elasticsearch.index.mapper.ParentFieldMapper;
import org.elasticsearch.index.mapper.Uid;
import org.elasticsearch.index.mapper.UidFieldMapper;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHitField;
import org.elasticsearch.search.fetch.FetchSubPhase;
import org.elasticsearch.search.internal.SearchContext;
import org.elasticsearch.search.internal.SubSearchContext;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
public final class InnerHitsContext {
private final Map<String, BaseInnerHits> innerHits;
public InnerHitsContext() {
this.innerHits = new HashMap<>();
}
public InnerHitsContext(Map<String, BaseInnerHits> innerHits) {
this.innerHits = Objects.requireNonNull(innerHits);
}
public Map<String, BaseInnerHits> getInnerHits() {
return innerHits;
}
public void addInnerHitDefinition(BaseInnerHits innerHit) {
if (innerHits.containsKey(innerHit.getName())) {
throw new IllegalArgumentException("inner_hit definition with the name [" + innerHit.getName() +
"] already exists. Use a different inner_hit name or define one explicitly");
}
innerHits.put(innerHit.getName(), innerHit);
}
public abstract static class BaseInnerHits extends SubSearchContext {
private final String name;
private InnerHitsContext childInnerHits;
protected BaseInnerHits(String name, SearchContext context) {
super(context);
this.name = name;
}
public abstract TopDocs topDocs(SearchContext context, FetchSubPhase.HitContext hitContext) throws IOException;
public String getName() {
return name;
}
@Override
public InnerHitsContext innerHits() {
return childInnerHits;
}
public void setChildInnerHits(Map<String, InnerHitsContext.BaseInnerHits> childInnerHits) {
this.childInnerHits = new InnerHitsContext(childInnerHits);
}
}
public static final class NestedInnerHits extends BaseInnerHits {
private final ObjectMapper parentObjectMapper;
private final ObjectMapper childObjectMapper;
public NestedInnerHits(String name, SearchContext context, ObjectMapper parentObjectMapper, ObjectMapper childObjectMapper) {
super(name != null ? name : childObjectMapper.fullPath(), context);
this.parentObjectMapper = parentObjectMapper;
this.childObjectMapper = childObjectMapper;
}
@Override
public TopDocs topDocs(SearchContext context, FetchSubPhase.HitContext hitContext) throws IOException {
Query rawParentFilter;
if (parentObjectMapper == null) {
rawParentFilter = Queries.newNonNestedFilter();
} else {
rawParentFilter = parentObjectMapper.nestedTypeFilter();
}
BitSetProducer parentFilter = context.bitsetFilterCache().getBitSetProducer(rawParentFilter);
Query childFilter = childObjectMapper.nestedTypeFilter();
int parentDocId = hitContext.readerContext().docBase + hitContext.docId();
Query q = Queries.filtered(query(), new ParentChildrenBlockJoinQuery(parentFilter, childFilter, parentDocId));
if (size() == 0) {
return new TopDocs(context.searcher().count(q), Lucene.EMPTY_SCORE_DOCS, 0);
} else {
int topN = Math.min(from() + size(), context.searcher().getIndexReader().maxDoc());
TopDocsCollector topDocsCollector;
if (sort() != null) {
try {
topDocsCollector = TopFieldCollector.create(sort().sort, topN, true, trackScores(), trackScores());
} catch (IOException e) {
throw ExceptionsHelper.convertToElastic(e);
}
} else {
topDocsCollector = TopScoreDocCollector.create(topN);
}
try {
context.searcher().search(q, topDocsCollector);
} finally {
clearReleasables(Lifetime.COLLECTION);
}
return topDocsCollector.topDocs(from(), size());
}
}
}
public static final class ParentChildInnerHits extends BaseInnerHits {
private final MapperService mapperService;
private final DocumentMapper documentMapper;
public ParentChildInnerHits(String name, SearchContext context, MapperService mapperService, DocumentMapper documentMapper) {
super(name != null ? name : documentMapper.type(), context);
this.mapperService = mapperService;
this.documentMapper = documentMapper;
}
@Override
public TopDocs topDocs(SearchContext context, FetchSubPhase.HitContext hitContext) throws IOException {
final Query hitQuery;
if (isParentHit(hitContext.hit())) {
String field = ParentFieldMapper.joinField(hitContext.hit().getType());
hitQuery = new DocValuesTermsQuery(field, hitContext.hit().getId());
} else if (isChildHit(hitContext.hit())) {
DocumentMapper hitDocumentMapper = mapperService.documentMapper(hitContext.hit().getType());
final String parentType = hitDocumentMapper.parentFieldMapper().type();
SearchHitField parentField = hitContext.hit().field(ParentFieldMapper.NAME);
if (parentField == null) {
throw new IllegalStateException("All children must have a _parent");
}
hitQuery = new TermQuery(new Term(UidFieldMapper.NAME, Uid.createUid(parentType, parentField.getValue())));
} else {
return Lucene.EMPTY_TOP_DOCS;
}
BooleanQuery q = new BooleanQuery.Builder()
.add(query(), Occur.MUST)
// Only include docs that have the current hit as parent
.add(hitQuery, Occur.FILTER)
// Only include docs that have this inner hits type
.add(documentMapper.typeFilter(), Occur.FILTER)
.build();
if (size() == 0) {
final int count = context.searcher().count(q);
return new TopDocs(count, Lucene.EMPTY_SCORE_DOCS, 0);
} else {
int topN = Math.min(from() + size(), context.searcher().getIndexReader().maxDoc());
TopDocsCollector topDocsCollector;
if (sort() != null) {
topDocsCollector = TopFieldCollector.create(sort().sort, topN, true, trackScores(), trackScores());
} else {
topDocsCollector = TopScoreDocCollector.create(topN);
}
try {
context.searcher().search(q, topDocsCollector);
} finally {
clearReleasables(Lifetime.COLLECTION);
}
return topDocsCollector.topDocs(from(), size());
}
}
private boolean isParentHit(SearchHit hit) {
return hit.getType().equals(documentMapper.parentFieldMapper().type());
}
private boolean isChildHit(SearchHit hit) {
DocumentMapper hitDocumentMapper = mapperService.documentMapper(hit.getType());
return documentMapper.type().equals(hitDocumentMapper.parentFieldMapper().type());
}
}
}
|
